Venturi for carburetors



Sept. l 13, 1.927.

c.I cARLssoN .VENTURI FOR CARBURETORS 4Filed Nov. 1925 inv/Mz ma Patented Sept. 13, 1927. z V

UNITED v'STATES 1,642,332 PATENT; OFFICE. .l

CARL cARLssoN, oFs'rocxHoLM, SWEDEN.

VENTURI 'non cnBUaEToR's.

Application filed November 9, 1925, `Serial 11a-67,862, and inV Sweden November 29, 1924.

The present invention relates to a venturi, or a disperser for-fluid fuel, designed for carburetors for internal combustion engines and the like, and is specially constructed forv I intimately mixing the fuel with air.

In venturis for carburetors of hereto used types, the mixing of the fuel with air is generally effectuated' by the air passing along and around a nozzle, or inside a nozzle, provided with fuel supply holes, and thus sucking out the fuel. kBy this' means the fuel enters the air in the shape of jets and is generally not sufficiently dispersed. yEspecially if the sucking'is slight, thev fuel is apt to be deposited as small drops on the wall of the tubing, conducting it to the motor, and to cause irregularities' in the working of the latter.

The present invention purposes a con- *0 struct-ion, that abolishes this trouble of the fuel being deposited as drops, by dispersing the fuel in such a way, that every part of the air receives its share of t-he fuel. If the fuel is thus evenly distributed, the air is able to absorb it all, and-no drops will bo formed. v

The invention is illustrated, by wayvof example, in the accompanying drawings, in which Fig. l is a longitudinal section of an einbodiment of the invention, placed in a carburetor,

Fig. 2 is a cross section of same, along the line A-A of Fig. l, viewed from above,

Fig. 3 is a similar cross section of another embodiment,

Fig. 4 is a longitudinal section of a third embodiment,

Fig. 5 is the same embodiment, viewed from above, and

Fig. 6 is a longitudinal sect-ion of a fourth embodiment of the invention.

For the purpose set forth the venturi b of the invention is shaped as an exteriorly cylindrical ring, suiting the cylindrical inside of a carburetor, a, c, and interiorly hollowed out conically from bot-h ends, forming a cavity n, narrowing towards the middle of said ring, as is shown in the Figs. l, 4 and 6. In'this narrower part of said ring b are cut out longitudinal channels m, in the shape of open grooves, Figs. l, 4 and 3, of cylindrical or conical or double-conical holes, parallel tothe axis of the ring or "15 venturi, Figs. l and 4, or inclined towards this axis, Fig. 6, or sidewise inclined.

When said channels are open grooves, the) can have'rectangular cross section, as in Fig. 2, or triangularor cut triangularcrosssection, as in Fig. 3, or semirci-rcular or other suitable cross section.

Further the Venturi b 1s provided with two rows ory tiers of fuel supply holes, d, e, piercing its wall, radially or nearly so, openingon the inside, one row into said longitudinal channels m and the other row directly into the interior cavity n, in the interstices between. saidV channels m. vThese two rows of holes may been the same level, Fig. l, or on different levels, Figs. 4 and 6. The other ends of said fuel supply holes and e open into an" annular channel f cut out in the outer cylindrical surface of the venturi. Further a central piece o Fig. 6, may be provided for the directing ofthe air,lcylindrical,fas in Fig. 6, o r conical and axially movable. l

The said annular channel f communicates with a fuelsupply channel g., cut through the wall of the carburetor a and leading from a fuel supply tankrh with, for instance, a iloatgagep to keep the lfuel level constant. Said fuel supply channelV g; further communicates with anV air inletchannel Z, likewise cut out in the wall of the carburetor a, and with an opening 7c to the open air.

For the regulating of the air and fuel supply a throttle valve z' may be provided a greater number increases the effect of the f dispersing, but above this limit the said channels and holes become too small and are apt to be choked up.

The venturi according to the invention works in the following manner. The air enters from one end, at a in Fig. l, and is, in the venturi, cut up into one central current and, by the longitudinal channels m, several peripherie small currents. By the vacuum, or suction, caused by the motor, or by the passing of the air currents, fuel is sucked out from the fuel supply holes d, e. The central current receives its share of fuel from one row, CZ, of fuel supply holes, and the several peripherie air currents receive each its share through one of the holes e of the other row. Thus the fuel is nearly evenly distributed in the air, each part of the air receiving its share of the fuel. At thel inner ends of the longitudinal channels fm. all the air currents meet and mix together, whereby the fuel is still better dispersed in the air, especially if said longitudinal channels m are inclined to the axis of the venturi, effecting a whirling motion of the air current.

The fuel supply channels g communicating with the outer' air through the air inlet channels Z, the fuel is already in the fuel supply holes el, e mixed with some air, which still further facilitates the dispersing of the fuel in the air currents.

If the fuel supply holes CZ, e are placed on different levels, the fuel will, if the suction is slight, be provided only through the holes of the lower level, which is a great advant-age, as the air volume then being smaller requires less fuel. At an increase of the suction, or the velocity of the air current, the air volume also increases and additional fuel is sucked out through the higher row of fuel supply holes, the larger volume of air being capable of absorbing a greater quantity of fuel. The strength of the suction can be regulated to the requirement of the motor by the throttle valve e'.

The fuel supply holes (l, c may be arranged in different ways, without affecting the effectivity of the venturi. Thus either of the rows Z or c may be placed on the higher or the lower level, or the holes in either or both rows may be alternately placed on different levels.

The invention is moreover susceptible of various changes in its form, proportions and minor details of construction, and the right is herein reserved to make such changes as properly fall within the scope of the appended claims.

Having described the invention, what I claim is:

l. A venturi for carburetors and the like, consisting of an eXteriorly cylindrical ring, interiorly hollowed out by a double-conical cavity, and provided with longitudinal air channels communicating with said cavity, fuel supply holes piercing the wall of the venturi, said fuel supply holes being arranged in two rows, one of said rows opening into said longitudinal channels, and the other rowr directly into the narrower part of said double-conical cavity in the interstices bet-Ween said longitudinal channels.

2. A venturi for carburetors and the like, consisting of an exteriorly cylindrical ring, interiorly hollowed out by a double-conical cavity, and provided with longitudinal air channels communicating with said cavity, fuel vsupply holes piercing the wall of the venturi, said fuel supply holes being arranged in two rows, one of said rows opening into said longitudinal channels, and the other row directly into the narrower part of Ysaid double-conical cavity in the interstices between said longitudinal channels, said two rows of fuel supply holes being arranged on different levels.

In testimony whereof l have hereunto af-4 fixed my signature.

CARL CARLSSON. 

